import java.util.HashMap;
import java.util.Map;

public class mapdemoHMCzerosixzeronine

{

    public static void main(String[] args)
    {
        int [] a={1,7,8,7,5,6,2,2,3,4,1};
        Map<Integer,String> m=new HashMap<>();
        for(int i=0;i<11;i++)
        {
            m.put(a[i],"");
        }
        for( int x :m.keySet())
        {
            System.out.println("key:"+x);
        }
    }


}
